English verb conjugation
COULD VULCANIZE

Regular verb: vulcanize - vulcanized - vulcanized

Affirmation

Simple form	V-ing form
I could vulcanize you could vulcanize he could vulcanize we could vulcanize you could vulcanize they could vulcanize	I could be vulcanizing you could be vulcanizing he could be vulcanizing we could be vulcanizing you could be vulcanizing they could be vulcanizing
Perfect	V-ing perfect
I could have vulcanized you could have vulcanized he could have vulcanized we could have vulcanized you could have vulcanized they could have vulcanized	I could have been vulcanizing you could have been vulcanizing he could have been vulcanizing we could have been vulcanizing you could have been vulcanizing they could have been vulcanizing

Negation

Simple form	V-ing form
I could not vulcanize you could not vulcanize he could not vulcanize we could not vulcanize you could not vulcanize they could not vulcanize	I could not be vulcanizing you could not be vulcanizing he could not be vulcanizing we could not be vulcanizing you could not be vulcanizing they could not be vulcanizing
Perfect	V-ing perfect
I could not have vulcanized you could not have vulcanized he could not have vulcanized we could not have vulcanized you could not have vulcanized they could not have vulcanized	I could not have been vulcanizing you could not have been vulcanizing he could not have been vulcanizing we could not have been vulcanizing you could not have been vulcanizing they could not have been vulcanizing

Interrogative form

Simple form	V-ing form
could I vulcanize? could you vulcanize? could he vulcanize? could we vulcanize? could you vulcanize? could they vulcanize?	could I be vulcanizing? could you be vulcanizing? could he be vulcanizing? could we be vulcanizing? could you be vulcanizing? could they be vulcanizing?
Perfect	V-ing perfect
could I have vulcanized? could you have vulcanized? could he have vulcanized? could we have vulcanized? could you have vulcanized? could they have vulcanized?	could I have been vulcanizing? could you have been vulcanizing? could he have been vulcanizing? could we have been vulcanizing? could you have been vulcanizing? could they have been vulcanizing?

Interro-negative form

Simple form	V-ing form
could I not vulcanize? could you not vulcanize? could he not vulcanize? could we not vulcanize? could you not vulcanize? could they not vulcanize?	could I not be vulcanizing? could you not be vulcanizing? could he not be vulcanizing? could we not be vulcanizing? could you not be vulcanizing? could they not be vulcanizing?
Perfect	V-ing perfect
could I not have vulcanized? could you not have vulcanized? could he not have vulcanized? could we not have vulcanized? could you not have vulcanized? could they not have vulcanized?	could I not have been vulcanizing? could you not have been vulcanizing? could he not have been vulcanizing? could we not have been vulcanizing? could you not have been vulcanizing? could they not have been vulcanizing?